Face recognition is the process of matching faces to determine if the person shown in one image is the same as the person shown in another image. This is distinct from face detection which only determines where in an image exists a face. Face recognition has broad use in security technology, social networking, cameras, etc.

- Stackoverflow.com Wiki
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Facebook’s algorithms are able to recognize your friends’ faces after they have been tagged only a few times. It’s pretty amazing technology — Facebook can recognize faces with 98% accuracy which is pretty much as good as humans can do!